<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
  <form action="" method="post">
      <input type="text" name="xingming" value="姓名" onfocus="this.value= '';"
      onblur="if(this.value==''){this.value='姓名';}" required="">
      <input type="text" name="邮箱" value="邮箱" onpause="this.value='';" onblur="if(this.value==''){this.value='邮箱';}" required="">
      <input type="text" name="" value="" onpause="this.value='';" onblur="if(this.value==''){this.value='电话'}" required="">
      <input type="text" name="" value="" onpause="this.value='';" onblur="if(this.value==''){this.value=''}" required="">
      <input type="text" name="" value="" onpause="">
      <input type="submit" value="tijiao">
  </form>
<form action="" method="post"></form>
</body>
</html>